Archived

Avalanche Forecast

Mar 14th, 2013–Mar 15th, 2013

Alpine

3: Considerable

The avalanche danger rating in the alpine will be considerable

Treeline

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

2: Moderate

The avalanche danger rating below treeline will be moderate

Alpine

3: Considerable

The avalanche danger rating in the alpine will be considerable

Treeline

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

2: Moderate

The avalanche danger rating below treeline will be moderate

Alpine

3: Considerable

The avalanche danger rating in the alpine will be considerable

Treeline

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

2: Moderate

The avalanche danger rating below treeline will be moderate

Regions: Kananaskis.

Another warm storm system has added another layer of snow that is readily available for slab development. Anticipate changing conditions and be prepared for a variety of traveling conditions. Stepping down is a possibility as well.

Confidence

Good

Weather Forecast

Temps are expected to cool off in the alpine by 5 degrees but remain around 0 for TL elevations(1500m). No precip is expected and winds are still forecasted to be strong to extreme. Another round of precip is expected to arrive Sunday. How this interacts with the existing snow will remain to be seen.

Avalanche Summary

No avalanches noted today, observations very limited due to poor vis. Bombing runs in neighboring areas triggered one notable Sz3 slab (E asp, 2300m). Cornices were reportedly very large as well.

Snowpack Summary

Inversion conditions today led to moist snow starting at 2000m. Rain crust on surface below that. Limited visibility today, but storm slabs from the ongoing wind event are certain at TL & ALP elevations. These slabs will remain reactive to human triggering in steep terrain at all elevations until the temperatures cool. The warm nature of the storm will promote slab development and cornice growth.

Avalanche Problems

Storm Slabs

New storm slabs are developing along ridgetops at treeline and above. A combination of above freezing temperatures, moist snow and rainfall up to 2100m will result in rapid slab formation.

Avoid freshly wind loaded features.>Avoid cross loaded slopes at or above treeline.>

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 5

Cornices

Alpine ridges

Avoid areas with overhead hazard.>Stay well back from cornices.>

Aspects: North, North East, East, South East, South.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Wind Slabs

Soft slabs and hard slabs are widespread in alpine and treeline areas. Natural avalanche activity has significantly reduced, but skier-triggering is possible in steep, convex and/or unsupported terrain.

Avoid convexities or areas with a thin or variable snowpack.>

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 5